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Finding the Fourth Proportional to 1,134.20, 1,700.39 and 647.60

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Solution

The fourth proportional to 1,134.20, 1,700.39 and 647.60 is: 970.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,134.20 : 1,700.39 = 647.60 : x
  2. Step 2: Convert to fraction form
    1,134.20/1,700.39 = 647.60/x
  3. Step 3: Cross multiply
    1,134.20x = 1,700.39 × 647.60
  4. Step 4: Simplify right side
    1,134.20x = 1,101,165.68
  5. Step 5: Solve for x
    x = 1,101,165.68/1,134.20
  6. Step 6: Final answer
    x = 970.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.